Can preamp tubes be replaced individually?

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imc2111

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Tube amp newbie here.. Heard that power tubes should be replaced in pairs (correct me if wrong), what's the deal with preamp tubes? Is it ok to replace individually?
 
No, preamp tubes don't need to be matched, nor do you have to adjust any voltage or watch for any ratings. Just pop it in, that's it. Make sure it's a 12AX7 or ECC83 (same thing, different name, the former is US, the latter European) though. If you use for example a 12AT7 or 12AU7 (aka ECC82 and ECC81), you might get a thin sound, or lower gain.
 
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